what triggers fuel pump relay 2 prime???
01-10-2010, 10:44 PM
#1
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Thread Starter
what triggers fuel pump relay 2 prime???
my rs turbo wouldnt start when warm & ive narrowed it down to the relay not primeing/pumping.
i bridged the relay & it runs everytime
i fitted a new relay but the original problem was back
i have bridged the relay again & its fine so it isnt the relay itself its whateva tells the relay 2 work??????
is this the fuel ecu or is there a sensor on metering unit etc......??????
i bridged the relay & it runs everytime
i fitted a new relay but the original problem was back
i have bridged the relay again & its fine so it isnt the relay itself its whateva tells the relay 2 work??????
is this the fuel ecu or is there a sensor on metering unit etc......??????
02-10-2010, 08:48 AM
#2
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It primes on ignition then pumps when it sees tacho pulses from the negative side of the coil. The relay also has a crank signal so it knows when the engine is being cranked over.
02-10-2010, 10:15 AM
#4
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Thread Starter
mine has ignition feed as it is bridged off that atm
maybe ill have a play & try change fuel ecu & see what that does as im getting nothing when warm, no pump on ignition or crank
maybe ill have a play & try change fuel ecu & see what that does as im getting nothing when warm, no pump on ignition or crank
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